1121381628 has 48 divisors (see below), whose sum is σ = 2721116160. Its totient is φ = 358993600.

The previous prime is 1121381621. The next prime is 1121381669. The reversal of 1121381628 is 8261831211.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1121381621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58033 + ... + 74903.

It is an arithmetic number, because the mean of its divisors is an integer number (56689920).

Almost surely, 2^1121381628 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1121381628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1360558080).

1121381628 is an abundant number, since it is smaller than the sum of its proper divisors (1599734532).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121381628 is a wasteful number, since it uses less digits than its factorization.

1121381628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17098 (or 17096 counting only the distinct ones).

The product of its digits is 4608, while the sum is 33.

The square root of 1121381628 is about 33487.0367157203. The cubic root of 1121381628 is about 1038.9256743751.

The spelling of 1121381628 in words is "one billion, one hundred twenty-one million, three hundred eighty-one thousand, six hundred twenty-eight".